Apparatus eoe



HQ l

4 Sheets-Sheet 1 J. A. HEIDBRINK APPARATUS FOR DELIVERING A MHIK'IURE` OF GASES Original Filed Sept.

`July 22 1924.

NVENTOR: JY A. HEIDBRINK. BY 0Mf QM fhTm/Ewiv July 22 1924. Re. 15,874

J. A. HEIDBRINK APPARATUS FOR DELIVERIG A MIXTURE OF GASES Original Filed Sept. 26, 1912 4 Sheets-Sheet 2 INve/VTOR:

m N f T T .iA A Y. 1 .JAW Y July 22. 1924. Re. 15,874

J. A. HEIDBRINK APPARATUS FOR DELIVERING AMIXTURE OF GASES Original Filed Sept. 25, 1912- 4 Sheets-Sheet 5 IfvvENToR: JY A. HE/DBR/NK.

A T TOR/VE Y6.

July 22 1924. Re. 15,874

' J. A. HEIDBRINK y l APPARATUS VFOR DELIVERING A MIXTURE OF GASES Original Filed Sept.. 2s, 1912 4 sheets-sheet 4 I N vE/v TOR: J Y A. HE/DBR/NK.

dBY

A TToR/vsns lingualJ\1ly2z,l1s a24.A y. y,

UNITED STATES PATENT OFFICE.

J' AY A. HEIDBRINK, 0F MINNEAPOLIS, MINNESOTA.

Arr-Amicus ron. DELIVERING A MIXTURE or GASES.

original No. 1,265,910, dated my 14, 1918, Serial No. 722,455, led September 26, 1912. Application for' remue qleanay 2, 1924. serial No. 710,662.

y To all 'whomlit may concern:

' Minneapolis, in the county of Hennepin and State of Minnesota, have invented certain new and useful Im rovements in Apparatus for Delivering a xture of Gases, of which the following is al specification.

My inventlon relates to an apparatus for delivering a mixture vof'two or more gases to be used as an anesthetic. The invention has for its object primarily to deliver to a 4gas administering passage and respirator a mixture of two gases, such, for example, as nitrous oxid and oxygen in proper proportions .for producing anesthesia in a given patient. And the apparatus embodying `my invention provides means for ready and instant control of the flow of. gas so that the roportions of gases may be varied at will,

ut such that when a given proportion of gas is desired nore or lless of gas mixture in such proportion may be delivered at will to the'gas bag and the flow of gas in that proportion be continued indefinitely whatever the rate of How of the mixture.'

It is also an object of my invention to provide means whereby the mixture of 'gases .may be cut off and a single gas such vas pure oxygen be fed to the respirator. I also provi e means for warming the gas as it passes from the container to the gas bag aswell as means for permitting re-breathing where such may be desirable.

The full objects and advantages of my invention will a pear in connection with the detailed descrlption thereof and the novel features thereof are particularly pointed out in the claims.

In the drawings, illustrating the application-of my invention in one form,-

Figure 1 is a side elevation of a gas administering apparatus embodyin my invention. Fig. 2 1s a plan view o the same.

Fig. 3 is a fra entary sectional elevation on line 3-3 of ig. 2. Fig. 4 is a sectional view ofthe valve mechanism shown in Fig. 3 viewed at right angles thereto. Fig. 1s an enlarged view of the scale fol-indie ting the valve openin Fig. 6 indicates 5r/form of marking for t` e dia s of the gages. Flg. 7 is a detail sectional view of one of the reducing valves taken on line l7 7 of F1g. 2. Fig. 8 is a sectional plan view taken on llne 8-8 of Fig, 7. Figs. 9 and 10 are seetlonal plan views taken on lines 9+9 and 10-10, res ectively, of Fig. 1.

n ordinary base 10 has secured centrally thereon a standard 11 threaded into a soc-ket 12 in a table 13 having a pair of arms 14.

Each of the arms 14 has secured thereto a crossbar 15 provided with a valved aperture i force the said nipple within said socket in a gas-tight manner. The containers 19 on one side of the machine will contain nitrous oxid, those on the other side will contain oxygen, where the mixture of gases is to be nitrous oxid and oxygen. As shown in the drawings, containers at the right are charged with nitrous oxid and those at the left. with oxygen. l/Vithin a socket 23 formed onthe top of table 13 is secured by threading or otherwise a short standard 24. Suplported upon the standard 24 is a casting 25 aving a mixing chamber 26 from which extends a passageway 27. The passageway 27 is provided with a .perforated partition 28, a -iap valve or vibrating disk 29 operating to close the vapertures in partition 28 when the pressure from outside of mixing ichamber' 26 exceeds the Apressure inside said being provided with an inside shoul er -64 adapted to seat within an aperture for receiving the same in the partition 28. The

spindle 30 also 'has an outer shoulder 31 spaced from the inner shoulder. 64 so that the disk 29 is permitted to vibrate on spindle 30 between theshoulders 64 and.31.-a distance suicient to permit ready passage of the mixture during inhalation. `The spindle .30 has on the inner end, inside partition 28, a cap 32 formed to cover the apertures in partition 28 when said cap is 'brought into engagement therewith. A spring 33 surroun s the spindle`30 and engages a seat in the partition 28 and another seat in the cap In the position of chamber, ca'm 34 may 32 o rat' to push dle iriiewarldllr s'o as normally to bring .the shoulder 64 into its recess in the partition 28, in which position disk 29,*at its inward movement, will contact with partition 28 and close the apertures therein from the outside, therebyY preventing rebreathing. the arts, as shown in 32 will ]ust engage the pemember 34 protruding 27 and operated by Fi 3, the cap rip ery of a cam within the passageway a thumb nut 35. Turning the thumb nut will rotate the cam member, moving the cap and spindle, with the shoulders thereon` out ward so that vshoulder 64 is brought out of its seat and diaphragm 29 can no longer,lon its inward movement, engage partition 28 and close the apertures therein. This will permit rebreathing of the anesthetizing mixture; thus the exhalations of the patient may pass through the apertures in partition 28 and into the container or gas bag 65 which opens through connection 66 in to passageway 27 inside of partition 28. of rebreathing ma -be varied by varying the position ofs ind e that the diapliragm may approach more or less close to partition 28, thereby producing a greater or less opening for rebreathing. If it is desired to c ose entirely the connection from the respirator with the mixing be operated to force the cap 32 into engagement with partition 28, thereby closing the apertures therein. Or, if desired, these members may be omitted entirely and the passageway 27 be made continuous with the gas administering passageway 27 in the tube 59, which leads to the respirator.

Each of the gas containers comprises a source of sufpply Vof gas under pressure and leo ways are similar for each from each o the repective gas containers 19, that for oxygen and also that for nitrous oxid, there is a passageway connection extending to the mixing chamber 26 whereby the respective gases are conducted to the mixing chamber where they become mixed and from whence they are delivered to the gas administering passages. These passagegas. The nitrous oxid gas is admitted by hand wheel 21 into passageway 16 from `which it passes to and throu h a connecting passageway 36 into and t rough a reducing va ve mechanism 37 of well-known construction.

gas similarly is admitted to its passageway 16 from which it enters a connecting passa way 38 and passes into and through a re ucing valve structure 39 in all respects similar to the reducing valve 37. Fom 'the valve 37the nitrous oxid is cony a passageway 40 to a valve head of the walls of chama short chamber 42, from whence the nitrous oxid reducin ducted 41 secured to the top said cap` and the spin- 'mixing chamb 41 has the bottom wall thereof i The extent 30 and shoulder 64 so.

The oxygen gas mixing chamber, as clearly shown in Fig. 4, the connection 40 being provided with a cutoif valve 43, as indicated in Fig. 1. Similarly, the oxygen is conducted from the reducin valve 39 through a connection 44 to an in ependent chamber 45 in the valve head 41, from whence it is delivered past the valve mechanism into the mixing chamber, a cut-oitl valve 46 being also provided to shut olf oxygen from the chamber 45. There is thus a continuous passageway between the nitrous oxid container and the mixing chainber and a separate similar passageway between the oxy en container and the mixing chamber each 'aving a valve at its termination for admitting gas into the mixing chain-l ber and a second valve in each passageway for reducing the pressure of the gas to a relatively low pressure for delivery' to the The head forming the roof of thechainber 26, which bottom wall or roof is milled smooth and true. From the chamber 42 an aperture 47 extends into chamber 26 and from chamber A45 an aperture 48 extends into chamber 26. Diiferent proportions of nitrous oxid and oxygen may be employed for am anesthetizing mixture, according to the experience and practice of the operator and the character of anesthesia desirable to produce. In general it may be said that the proportions of oxygen and nitrous oxid to produce analgesia, or the low form of anesthesia, in which the sensory nervesl are inactive although reason is retained by the patient, would be something like four parts ofniasses through a valve structure into the trous oxid to one part of oxygen. I prefer, Y

therefore, to form the apertures 47 and 48 of such size in relation to the form of valve ferred form shown herein, which is subject to easy control, comprises a disk 49 on a' shank 50 threaded into the valve head 41, the disk 49 being in the chamber 26 and comingI below the apertures- 47 and 48, the surface of the disk adjacent to said apertures and the bottom wall of head V41 being milled smooth and true so that when said disk is drawn upagainst the bottom wall, it will t tightly therewith and wholly cut olf all flow of gas The threaded shank 50 has in the outer end thereof a thumb nut 51 by which the same may bc turned, turning of the shank 50 having the ell'ect of moving the disk 49 away from or toward the bottom of the head 41.

The cut-off valves 43 and 46 are formed 1n short pipe sections 52 and 53 into which through the apertures 47 and 48..

the connecting pipes`40 and 44 respectively, deliver, and the pipe section 52 has at the end thereof a gage 54, at all times subject subjectto complete manual control by means ofva hand nut 56 on valve 37 and a hand nut 5.7 on valve 39. The pressure of the as being delivered Ifrom each of the .reducing valves (tliat is,.nitrous oxid from valve 37 and oxygen from valve 39) may thus bev instantly. and accurately regulated. Y y

These reducing valves, as stated, are .of

well-known construction, being separately fabricated a-nd sold, and are introduced into the mechanism in the following manner. A base member 129 in each case is secured to arms 130, 131 formed integral with the mixing chamber casting 25. This base member has a cup-shaped portion'indicated at 132 upon which rests a dia hragm 133. A cap 134 having a hexagona port-ion is screwed into the cup-shaped member 132 and engages and holds the diaphragm in position around its circumferential edges. A compression spring 135 engages a b ook 136 on the outside of the diaphragm and another block 137 at its upper end, which last-namedblock in turn isy engaged by the nose4 138 of the hand nut 56 (57 of valve 29) `threaded into the cap 134 whereby a desired degree of pressure is' exerted by the spring upoil the diaphragm 133, which diaphragm-is. sealed from atmosphere on its underside but is open to atmosphere on its up r side through the duct 139 in cap 134. n extension 140 of the oase casting -129 is provided with a passageway 1414 communicating through the pipe 36 with the nitrous oxid containers the oxygen'containers 19). The as from the passageway 141 may escape t rough a valve duct 142 into a chamber 143 immediately below the diaphragm 133, from whence nitrous oxid gas continues through passageway 40 (the oxygen going through passageway 44) to the mixing chamber 26. A boss 144 forms a cylindrical continuation of a part of the chamber 143, and Within the cylindrical interior of this boss is a rectangular slide 145 carrying at 1t s `closed upper end a rubber plug 146 held in a s eat integral with the slide 145. .A compression spring 147 within the hollow portion of the slide 145 engages its top closure at one end, and a cap nut 148 at the other end whereby the slide, and particularl the rubber plug 146 carried thereby, is orced against-'the valve duct 142. A yoke. member 149 has its two legs 150, 151 engaging the top of the slide 145, while 'the yoke portion engages the diaphragm 133. A raised annular ring 19 (or through pipe 38 with one, and means is here spective gages, specifica y asv shown `on the 130 B i yy 152 will limit downward movement of the diaphragm 133. Operation of the vthumb nut 56 will compress spring 135, which in` turn will iputpressure upon diaphragm 133 from which the pressure is communicated ythrough' the yoke member '149 and its legs 150, 151 to the` slide 145, which is thereby caused to move againstA the pressure of' spring 147 to open the valve 142. The ad` missionv of gas in the chamber 143 will put 75 the as pressure upon thelunderside of the diap ragm 133, tending to push,it back against the pressure of spring 135, thus releasing the pressure of said spring from the yoke member 149 andpermitspring 147 to reseat the rubber plug 146, cutting off fiow of gas. In lthis manner the delivery pressure of s through the, passageway 40 is regulate to bel greater or less according to the amount of pressure or compression exerted through spring 135.

The ca 148 is hexagonal inl its outer con'- tour, as s own in Fig. 1, whereby the pressure upon spring 147 may be varied. This ca has cast therewith a boss 153 having a cy indrical interior chamber in which visa rectangular slide 154 corresponding with slide 145. A duct 155 communicates from the chamber 156 formed around the slide 145 with a corresponding chamber 157 95 formed around the slide 154 with a valve Seat 1,56 protruding downwardly around said duct. The slide 154 carries a rubber plugtI 158 which is forced into engagement with the valveportion 156 by a spring 159 seated 10' in the slide 154 and engaging a hexagonshaped cap 160 provided with apertures 161 f at its outer end. The cap 160 is threaded upon the boss 153 by means of which the desired amount of compression of spring 159 105 is obtained. Tle duct 155 is very much larger than the duct 142 and is subject to the pressure of gas at any time in chamber 143 and the communicating chamber 156 so that if the pressure of gas for any reason in chamber 143 should rise 'beyond a desired extent the plug 158 will be forced outwardly and the 'gas will escape through chamber 157 and ducts 161. i

The gas assageways, then, from the containers tot e mixing chamber comprise the duct 16, passageway 36, chamber 143 within the reducing valve 37, passageway 40, chamber 42 andaperti/ire 47 Afor the nitrous oxid, v while the corresponding but wholly independent passageway for the oxygen com-k rises a duct 16, a passageway 38, the chamer v14.3 in the reducing valve 39, the passageway 44,v the chamber 45 and the aperture 48 extending therefrom to the valve 125 plate in the mixin chamber. l

The apertures 4 and 48, as here shown,

have a relative delivery capacity of four to rovided on the rel oxygen gage, by which the proportions of the oxy en gas in any of the mixtures gioing to t e patient may be immediatel etermined by inspection. "Itwill be note that the gages 54 and 55, for nitrous oxid and' oxygen respectively, will be in all respects identical, and each may suitably be such as will register a maximum pressure of sixpounds, which is such a gage as would be scale 1n practice will show only the pressures at which this gas is being delivered. Upon the oxygen gage I form a second scale comprising figures up to twenty four or higher for indicating the percentage of oxygen in the mixture of gases being delivered at the indicated oxygen pressure when the pressure of the nitrous oxid as indicated u on its scale is at a predetermined point; that 1s the needle of the oxy en gage will indicate the delivery pressure 0% oxygen on the' pressure scale and at the same time will indicate on the second scale the lpercentage of oxygen being delivered in the mixture of gases passing-to the gas bag and respirator. This percenta e scale is, for any one gage, developed .on y for one fixed or predetermined pressure of the nitrous. oxid as indicated by the nitrous oxid pressure gage scale. Inthe scale construction shown in Fig. 6 of the drawings, the oxygen percentage scale is developed to show the percentages of oxygen in the mixture of gases going to the atient when the nitrous oxid pressure, as s own b the -nitrous oxid gage, is at five pounds, t is being a satisfactory and convenient pressure for nitrous oxid. It will be understood that the pressure indication of either age is controllable at will by means 0% the thumb screws 56 and 57 of the reducing valves, so that it will always be practicable to have a fixed reading upon the n`itrous oxid gage, this being, as shown, five pounds. In varying the proportion o f oxygen in the mixture, it will usually only be necessary to vary the pressure at which the oxygen is delivered to the mixing chamber, and such variation will not only show onv the ga e the pressure at which oxygen is being de ivered, but on the second scale will show the actual percentage of oxygen oing into the mixture which the patient is reathing. This is true, in the gage shown in Fig.' 6, only when the gage for nitrous oxid is set to dehver nitrous oxid at a pressure of ve pounds, to which the secondaryl scale for percentages of oxygen is graduated. It will thus be seen that the proportion of gases going to the patient iscontrollable at will and instantly bythe 'operator throu h the thumb screws 56 and 57, al-

thougi practically where a mixture'is delivered, owing to the ratio of size of the delivery apertures of the respective gases,there reducing valve 39 .tothe passageway 59 lead--v ing from be ond the dlaphragm 28 to the respirator, w ,ich connection is controlled by 'a cut-off valve 60. If it is desired at an time to give the patient pure oxygen to e t'ect quic-kvstimulus, the screw 35 and cam 34v may be turned to close the openings from passage 2 7 through diaphragm 28 and valve 6() opened, admitting oxygen directly to the patient..

VThe volume" of mixture being delivered throu h mixing chamber 26 is absolutely controllc by the thumb nut 51 operatin vthe vvalve disk 49, which, cooperating witg apertures 47 and 48, really comprises a double valve for simultaneously increasing or decreasing the rate of the flow of the nitrous oxid through aperture 47 and the oxygen through aperture 48 into the mixing chamber, each in the same proportional amounts, since the actual delivery opening 'of each valve will comprise the lateral area of va cylinder determined by the diameter of the respective apertures and the distance that the plate or disk 49 is moved away from the valve head through which the apertures extend. Since the areas of the bases of the cylinders are constant, the ratio of the lateral areas, that is the discharge openings, will not be changed by increasing or decreasing the length of the cylindersin the same amount, that is moving the valve plate 49 toward or fromthe valve aperture wall. In this connection it is to be understood that the actual extent of movement of the valve plate 49 will always be very smallrand can never be greater than the maximum capacity of the small oxygen aperture 48. The showing the in the drawings has of necessity been greatly exaggerated. As shown in Fig. 5, the shank 50 of the thumb nut 51 is provided with a pointer 61 vwhich coversa scale disk 62 on the top of the portion 41 forming the valve chamber. Pins 62 and 63 limit movement of the pointer 61 to a little more than half a full turn ofv vthe two gages 54 and`55. The second pin 63 is necessary since, if the valve were o en beyond the maximum capacity of the sma ler aperture, the proportion of gases being delivered would no longer remam as indicated, but gas from the larger aperture would be i delivered at'a relatively greater rate than from tlie smaller aperture. The pins 62 and 63 are so positioned relative Ato the rightr line movement of valve disk caused by the thread of shank 50 as to roduce the above indicated result. It is o vious that if the pitch of the threads on shank 50 were made suliiciently small a sin le pin 62 mi lit be employed to be engage on either side y the l l the respective gases will flow into the chamber 26 in the proportion indicated, and will the interior of casin always liow in that proportion whether the valve is opened little or much of its maximum capacity. The movements of the valve are controlled with the greatestease by the operator and will alwa s result in delivering the exact proportion o gas which is desired. The operation of the thumb nut 35 and cam 34 regulating the movement of head'32 and spindle 30 will determine the extent of rebreathing and will regulate this as desired. If the disk.29.has a'relatively large lamount of freedom of travel upon the spindle 30 andyet can always come back against diahra m 28, there will be little or no rereat in If, however, cam 34 is turned so as to us the shoulderv 64 on spindle 30 far enougv out so that disk 29 cannot come back into contact with diaphragm 28, rebreathing willbe permitted in proportion to the distance away from diaphragm 28 at which disk 29 is being held, it being noted of course that the usual gas `bag 65 opens through a connection 66 into passageway 27 extending from mixing chamber 26.

As clearly shown in Fig. 3, the mixing chamber 26 is oblong in shape, and .within said chamber and spaced from the inner walls thereof is a closed lthin walled casing 67 openin outwardly through an aperture in the am? wall 6,8 of chamber 26. Within 67 is inserted an ordinary incandescent e ectric light 69 orother electric heating device, as maybe desired. The gases entering through a ertures 47 and 48 will pass over the edges o valve disk 49 and How around the heated casing 67 on the way out through passage 27, and are thereby warmed to the desired extent before breath in In certain cases it is desirable to administer ether or other anesthetic either in combination with onel or both of the gases forming the usual mixture, or separately, and to accomplish this I provide an ether cup 70 having a connection through a tube 71 into chamber 26, saidether cup being provided with a droppvk: mechanism 71 of usual construction. e ether will drop upon the heated casing 67 and vaporizing will pass into the respirator tube and gas bag either separately or as part of the mixture, according as the samemay be used. I

I claim:

1. A gas administering machine comprising a plurality of sources of iuid supply, a `mixing chamber, means for causing each of said gases to be delivered into the'mixing chamber at a definite rate of flow so as to produce a mixture of said gases of.pre determined proportions, and means for simultaneously changing the rate of iow of each of said gases into the mixing chamber in the same proportional amount.

2. A gas administering machine com rising a plurality of sources of fluid supp y, a

mixing chamber, meansfor causing each or said gases to be -delivered into the mixing chamber at a definite rate of flow so as to produce a mixture of saidv gases of predetermined proportions, an inhaler connected with said mixing.` chamber for delivering' the mixture of gases to the patient as said mixture is produced, and means for simultaneously increasing the rate of flow of each of said gases into the mixing chamber in the saine proportionalamount for the purpose of forcing an increased amountiof said identical mixture of gases to the patient.

3. A gas administering machine com rising a plurality of sources of Huid supp y, a mixing chamber, a passageway leading from each of said sources of supply to the mixing chamber for conductin se arately into the mixing chamber, two va yves in each of said assageways, one valve in each passageway eing controlled in itsy operation yof delivering gas bythe pressure o the gas being delivered from said valve, means under the control of the operator for operating a valve in each passageway for vfixing the rate of How of each of said gases so aszto produce a mixture thereof of predetermined propprtionaand means underthe control of t e operator for simultaneously operating the Vother valve in each passageway so as to simultaneously change the rate of iow of each of said gases into the mixing chamber in the same proportional amount. e

4. Av as administering machine comprising a p urality of. sources ofy fluid sup ly, a mixing chamber, a pass way le ing from each of said sources o -.supply to the mixing chamber for conducting each of said gases separately into the mixing.` chamber, a valve in each of said passageways o erable to cause each of said ases to be de 'vered into the mixing cham r at av definite rate of fiow so as to produce a mixture of said lglases of predetermined roportions, an inaler connected with said chamber ico for. delivering the mixture of gases to the vof each of said gases into the mixing chamber in the same proportional amount for the' purpose of forcing an increased amount v of said identical mixture of gases to the inhaler and the patient.

5. A gas administering machine comprising a source of oxygen supply and a source of nitrous oxid supply each under pressure, a mixing chamber, a passageway leading from the oxygen supply and from the nitrous oxid supply to the mixing chamber for conducting each of said gases separately into the mixing chamber, means cooperating with said respective passageways for causing the gases to be delivered to the mixing chamber at reduced pressures,- means for determining the rate o flow of each of said gases at such reduced pressures so as -to produce a mixture thereof in predetermined proportions, and manually-operative means exterior of but cooperating with said passageways for simultaneously changing the rate of flow of each otsaid gases into the mixing chamber lin the same proportional amount. 'I

6. A gas administering machine compris-i ing a source of oxygen supply anda sepa.- rate source of nitrous oxid supply, a mixing chamber, a passageway leading from the oxygen supply and another passageway leading from the nitrous oxid supply to the mixing chamber for conducting each of. said gases separately into the mixing chamber, two controlling valves in each of said passageways, vmeans under the control of the operator for operating a valve in each passageway for fixing the rate of flow of the oxygen and of the nitrous oxd respectively so as to produce a mixture thereof of predetermined proportions, and means under the control of the operator for simultaneouslxT operating the ot er valve in each passageway so as to simultaneously change the rate of flow of each of said gasesinto the mixing chamber in the same proportional amount.

7. A gas administering machine comprising a plurality osources of fluid supply under pressure, a mixing chamber, a passageway leading from each of said sources of supply to the mixing chamber for conducting each of said gases separately into the mixing chamber, two valves in each of said passageways, means under the control ofthe operator for operating one valve iii eachv passageway for controlling the respective pressures at which the several gases arel delivered to' the' chamber, other means in said passageways for determining the relative rate of iow of each of said gases into the mixing chamber at'xed relative pressures so as to producea mixture thereof the mixing chamber in the sameproportional amount.

8. A gas .administering device having a.

mixing chamber,means lfor conducting independently and through separated `valve openings a lurality of gasesA into said chamber in {Eixed relative proportions, an integral valve member controlling the valve openings for both of said conducting means and having parts held in the same relation to the points of discharge therefrom, and,v

meansto move the valve members uniformly v in reference to said discharge openings to vary at will the aggregate vo gases into the mixing chamber while maintaining their respective delivery proportions constant. v

9. A gas administering device vhaving a mixing chamber provided with a plane,- faced wall and having independent separated valve apertures opening through said wall, means for. conducting a plurality of 4gases from independent sources of supply` independently through each of said valve aperturesl into the chamber in predetermined relative proportions, a valve closure having a plane-surfaced wall held iixed in spaced arallel relation with said wall of the chamer for controllingthe flow of gases through said valve apertures, and means to move the valve closure bodily so that the plane face thereof will be caused uniformly to approach or recede from said wall-to vary at will the aggregate How of gases into the mixing chamber while maintaining their respective delivery proportions constant.

10. A gas administering device having a mixing chamber, a valve head having a plane surface on one side forming a part of a wall of said chamber, said valve head being provided with a plurality of independent cavities and having independent valve apertures leading from said cavities into the mixing chamber, means for conducting a different gas into each of said cavities and tothe valve apertures, a valve disk within the mixing chamber having a smooth face cooperating with said plane-surfacedwall to co'ntrol all of saidv valve apertures, and means under. the control of the operator to move lthe valve disk bodily and uniformly toward wall of said mixing chamber, means for' ume of flow of a conducting di'erent gases at fixed relative pressures independently into the mixing chamber through each of said valve apertures, a single unitary valve member within the mixin chamber having portions cooperating wit and controlling the delivery openings of the res ective valve apertures,.

and means to move t e valve member so that said portions will be caused uniformly'to approach `andL recede from the respective valve apertures.`

12. A as administering device having a mixing c amber and a plurality of separated valve apertures extending through a wall' of said. mixing chamber, lsaid valve apertures varying in size for delivering fixed relative proportions of the gases when, the delivery pressures of the gases -are e ual, means for conducting different gases at xed relative lpressures independentlyv into the mixing c apertures, a single unitary valve member withinthe mixing chamber having portions cooperating' with and controlling the delivery openings of the respective valve apertures, means to move the valve member so that said portions will be caused uniformly to approach and recede from therespective valve a rtures, and means 'limiting movement o said valve member so that the maximum movement thereof away from the valve apertures will open the smallest' aperture only to its maximum capacit 13. A gas administering evice comprising separate containers of iuid under pressure, a mixing chamber and means for consaid fiuids independently thereto ductin throug se arate valve openings, a unitary valve mem er within the chamber adapted to block both of said openin s, and means to move the valve member de nitely and uniformly through predetermined distances so that the o ening-blocking portions thereof shall e caused to `recede from or to approach both said valve openings uniforml A 14. A gas administering device comprising separate containers of Huid under pressure, a mixing chamber provided with a plane-faced wall and having independent valve a ertures opening through saidwall, means or conducting the gases from said containers independently through each of said valve apertures into the chamber, a thumb-nut having a threaded shank extending through said wall and into said, chamber adjacent said valve apertures, a valve plate secured to the end of said shank in said chamber and having a plane face adjacent and parallel with the plane face of the wall and overlyin said valve apertures so that rotation of t e shank and plate by means of the thumb-nut will move the plate bodil away from or toward the face of said wa l and said valve apertures to vary at will the aggregate volume ofv flow of gases into the mixing chamber Without varying theirrelative delivery pressures. l

amber through each of said valve v. 15. A gas administering device comprising separate containers of fluid under pres- 5;,

-means and can be varied only by varying the relative delivery pressures of the gases, meansto regulate atvwill the delivery pressures'of each of said gases, means to indicate the pressures at which'said gases are delivered fordetermining the relative proportions oflgases going into the chamber and lthe quality of mixture produced, and means lfor regulatingand controlling the aggregate volume of flow of gases into the mixing chamber while maintaining `11'11- changed the proportions determined bythe delivery and pressure-controlling means.

' 16. A 'gas administering device compris` ing a pair of separate containers vone having nitrous oxid and the other oxy en stored un-l der pressure therein, v a Amixing chamber, means for conducting said gases independently from the containers to the mixing chamber, means in said conducting means for varying at will the relative pressures at which said gases are delivered, independent gages eachhaving connection with one of said conducting means and each provided with a scalefor indicating the pressure at which gas is being delivered, the oxygen gage being provided with a scale for indicating the percentage of oxygen in the mixture of gases being delivered at the indicated ox'ygen pressure when the pressure of the nitrous oxid as indicated upon its scale is at a predetermined point. v

17. A` gas administering device comprising a pair of separate containers one havin nitrous oxid and the other oxygen store under pressure therein, a mixing chamber, means for conducting said gases independently from the containers toithe mixing chamber including separated delivery apertures having different relative discharge areas for delivering proportionsV of the respective gases such as to produce a mixture of the'desired quality when the pressures of the gases are equal, means in said conduct.- in'g means for separately regulating the delivery `pressures of the respective gases, means for determining the delivery. pressures of `said gases so that said pressures may be equalized, and means limited in operation to permit no, more than maximum flow of. gas through the smallest aperture for varying `the aggregate volume of flow of said gases into the mixing chamber while 4maintaining the proportions determined by the delivery apertures and the' deliveryl i pressures of the gases.

18. A gas administering device having a ing chamber on the inner side of said disk,

and means controlled by the position of the disk so\as to permlt breathing of gas mixture from the mixing chamber at all times and to prevent -or permit, as desired, entrance of the, exhalations of the patient to the gas bag and consequent rebreathing of the gas mixture.

' 19. A gas administering device having a mixing chamber, a respirator tube connected with the mixing chamber vhaving a perforated partition, a gas bag having connection with the mixing chamber on the inner side of said' partition, a disk normally cooperating with said partition to open and close communication with the mixing chamber and gas bag during breathing so as to permit breathing of the gas mixture and prevent rebreathing, and controllablemeansr for holding said disk spaced from the partition during exhalation of the patient to permit rebreathing.

20. A -gas administering device having a mixin chamber, a respirator tube connected Withlt e mixing chamber having a perforated partition, a gas bag having connection with the mixing chamber on the inner side of said partition, a disk normally cooperating with said partition to open and close communication with the mixing chamber and gas bag durin breathing so as to permit breathing of tiie gas mixture andprevent rebreathing, a spindle on which said disk vibrates between ixed stops, and controllable means `for moving said spindle bodily endwise so as to position the stops thereon` so that the disk will be held spaced from said partition during exhalation to permit rebreathing of gas mixture.

, I testimony whereof I affix my signature hereby. JAY A HEID-BRINK. 

